Twin piston pump



FIG. 1 is a front elevational view of a twin piston pump in accordance with the invention;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a side elevational view thereof, illustrating the side opposite that depicted in FIG. 2;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a plan view thereof. 

The ornamental design for a twin piston pump, as shown and described. 